Scurvy...I think the compensating screw is at the bottom of the Saturn..you can try it and see. Before attempting compensation...
1. check to see whether it is a compensation issue or if the
compass is being affected by nearby metal or wiring
2. Is the 15 degrees off the SAME at all points of the
compass or does it vary if you point the boat due south or due west or due east. The problem may be either
compass alignment itself OR a need to compensate the
compass.
Check this link from Ritchie to see HOW to adjust your
compass in general terms.
http://www.ritchienavigation.com/ser...pensation.html